Which of the following indicates an area of high pressure on a weather map?

The presence of the letter "H" on a weather map signifies an area of high pressure. This notation is widely recognized in meteorology, and it indicates that the atmospheric pressure in that region is higher compared to the surrounding areas. High-pressure areas are typically associated with clear skies and fair weather because they discourage cloud formation and precipitation. The "H" helps meteorologists and the public quickly identify regions of higher atmospheric pressure and predict weather patterns based on that information.

In contrast, hollow circles often represent areas of low pressure, and solid lines are typically used to depict isobars, which are lines of equal atmospheric pressure but do not specifically indicate high or low pressure on their own. Vertical bars may be used in conjunction with other symbols but do not represent pressure zones in standard meteorological practices. This makes the letter "H" the clear indicator of high pressure on a weather map.